DI-770 Oscilloscope provides five virtual instruments in one

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DI-770 and WINDAQ/Scope Manual With this method only the currently active channels are read from the waveform file. The other channels will remain unchanged and they will remain switched off. To select the proper waveform read method, enter the File menu, select the Waveform read method item and select the correct method. When closing the application, the selected method is saved in the application settings file. This file is always read when starting the application. Comparing signals using the reference channels To be able to compare live signals to other signals, the oscilloscope, the data logger and the spectrum analyzer have two reference channels, R1 and R2. R1 is a reference channel for channel 1 and R2 is a reference channel for channel 2. These reference channels are filled once and remain unchanged while measuring. The references only change when new data is stored in the references. Fill the references To fill the reference channel(s), two ways are available: copying the current displayed signals to the reference channels or read previously saved waveform data from disk. To copy the current live signals to the reference channels, either press the corresponding button on the speed button tool bar ( ) or select the item Copy live to refs from the References menu. This will copy the waveform data from the active channel(s) to the corresponding reference channel(s). The settings of the channel(s) will also be copied to a special reference setting. If the reference channel(s) was (were) not yet displayed, it is (they are) switched on as well. To fill a reference channel with data from disk, see the paragraph on Loading saved measurement data from disk. The data in the reference channels will remain unchanged until new data is stored in the reference channels. The reference channels are displayed with the same record view offset and record view gain as the live channels. Changing the pre trigger value will not affect the reference channels. When the record length of the live channels is changed to a shorter record after filling the reference channels, less data of the reference channels is displayed, but the data is kept in memory. When the record length is changed to a longer record, the part of the reference channel that was not filled, is filled with zeroes. Switching references on or off Switching a reference channel on or off can be done by selecting the item Display Refx from the Reference menu, where x stands for 1 or 2. It can also be done by means of a button on the speed button tool bar: for reference 1 and for reference 2. When a button appears to be pressed, the corresponding reference is switched on. Scaling references When a reference channel is filled, the data remains the same until new data is stored in the reference channel. When the input sensitivity, the software offset or the software gain for the corresponding channel changes, the reference channel will not change. It can be useful that when a signal is copied to a reference channel to compare live measurements with that reference channel, that the settings of the reference channel will follow the settings of the live channel. So when e.g. the input sensitivity of the live channel changes, the reference channel is scaled in such a way that the live channel and the reference channel can still be compared on a 1:1 base. To do that, select the item Scale references from the Reference menu. Any change of the input sensitivity, the software offset or the software gain of a channel will also be applied to the reference channel. When scaling references is switched on, a check mark is placed in the menu item. To switch Scaling references off, select the Scale references item again. Software 26
DI-770 and WINDAQ/Scope Manual Update reference comment When a measurement is taken, three lines of comment text can be added to the measurement. This text is saved to disk together with the waveform data and printed out with the waveform. (See Add comment text to a measurement) When the reference channels are filled with data from a file and the comment text has to be changed, this can be done using the item Update comments ... from the Reference menu. After activating the item, a dialog appears in which the three lines of text can be entered / changed. When the dialog is closed with the OK button, the new text is automatically saved to disk. Documentation of measurements In the oscilloscope, the data logger and the spectrum analyzer several features are available to document measurement data. Add comment text to a measurement For explanation and documentation, each measurement can be supplied with three lines of text. This text will be saved together with the waveform data when the waveform is written to disk. The text will also appear on a hardcopy printout. To enter the text, open the Settings menu and select the item Comment... A dialog appears in which the three lines of text can be typed. To switch between the three lines, use the mouse or the key. Note: The text remains the same until new text is entered or the lines are cleared. So when text is entered and more than one waveforms is saved or printed, each waveform will have the same comment. Place a comment label When documenting a measurement, it can be useful to add some comment to a specific part of the signal. This can be done with the special comment labels. These comment labels are placed within the signal display at a specific position in relation to the waveform. The comment labels contain text and can have an arrow pointing at a specific point of the waveform. The shape, the colors and the arrow can all be customized to your specific wishes. When printing the measurement, the comment labels are placed as well. To place a comment label, press the comment label button ( ) or activate the Add a comment label item from the Settings menu. The comment label is now placed within the signal display. It can be dragged to any position with the mouse and the arrow can be dragged to any position as well. The comment labels are waveform based, when the record view offset or the record view gain changes, the position of the comment label remains the same in relation to the record. Edit a comment label To change the properties of a comment label, place the mouse pointer on the comment label or the arrow of the comment label and press the right mouse button. A menu will pop up in which all properties can be edited. Comment text... With this item the text in the comment label can be edited. An input dialog with a text input box appears after activating. Enter the text for the comment label in the input box. Multiple lines can be entered and will appear in the comment label as they appear in the text input box. Comment shape With this item the shape of the comment label can be selected. Three choices are available: a rectangular shape, a rectangular shape with rounded corners and an ellipse shape. Draw arrow With this item the arrow can be switched on or off. When the arrow is switched on, a check mark is placed in front of the menu item. Software 27
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DATAQ Instruments, Inc. 241 Springs
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DI-770 Oscilloscope provides five virtual instruments in one

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